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These macros are used to find structure members not covered by the “particular” test macros.
Check whether member is a member of the aggregate aggregate. If no includes are specified, the default includes are used (see Default Includes).AC_CHECK_MEMBER([struct passwd.pw_gecos], , [AC_MSG_ERROR([We need `passwd.pw_gecos'!])], [#include <pwd.h>])
You can use this macro for submembers:AC_CHECK_MEMBER(struct top.middle.bot)
Check for the existence of each ‘aggregate.member’ of members using the previous macro. When member belongs to aggregate, define
_member (in all capitals, with spaces and dots replaced by underscores). If action-if-found is given, it is executed for each of the found members. If action-if-not-found is given, it is executed for each of the members that could not be found.
This macro uses M4 lists:AC_CHECK_MEMBERS([struct stat.st_rdev, struct stat.st_blksize])